## Unreleased

Released YYYY-MM-DD.

### Added

* TODO (or remove section if none)

### Changed

* TODO (or remove section if none)

### Deprecated

* TODO (or remove section if none)

### Removed

* TODO (or remove section if none)

### Fixed

* TODO (or remove section if none)

### Security

* TODO (or remove section if none)

--------------------------------------------------------------------------------

## 0.4.7

Released 2020-10-14.

### Added

* Added an optimization to avoid unnecessarily consuming bytes from the
  underlying data when there is only one possible choice in
  `Unstructured::{int_in_range, choose, etc..}`.

* Added license files to the derive crate.

### Changed

* The `Arbitrary` implementation for `std::time::Duration` should now be faster
  and produce durations with a more-uniform distribution of nanoseconds.

--------------------------------------------------------------------------------

## 0.4.6

Released 2020-08-22.

### Added

* Added the `Unstructured::peek_bytes` method.

### Changed

* Test case reduction via `cargo fuzz tmin` should be much more effective at
  reducing the sizes of collections now. (See
  [#53](https://github.com/rust-fuzz/arbitrary/pull/53) and the commit messages
  for details.)

* Fuzzing with mutation-based fuzzers (like libFuzzer) should be more efficient
  now. (See [#53](https://github.com/rust-fuzz/arbitrary/pull/53) and the commit
  messages for details)

--------------------------------------------------------------------------------

## 0.4.5

Released 2020-06-18.

### Added

* Implement `Arbitrary` for zero length arrays.
* Implement `Arbitrary` for `Range` and `RangeInclusive`.

--------------------------------------------------------------------------------

## 0.4.4

Released 2020-04-29.

### Fixed

* Fixed the custom derive for enums when used via its full path (like
  `#[derive(arbitrary::Arbitrary)]` rather than like `#[derive(Arbitrary)]`).


## 0.4.3

Released 2020-04-28.

### Fixed

* Fixed the custom derive when used via its full path (like
  `#[derive(arbitrary::Arbitrary)]` rather than like `#[derive(Arbitrary)]`).

--------------------------------------------------------------------------------

## 0.4.2

Released 2020-04-17.

### Changed

* We forgot to release a new version of the `derive_arbitrary` crate last
  release. This release fixes that and so the `synstructure` dependency is
  finally actually removed in the cargo releases.

--------------------------------------------------------------------------------

## 0.4.1

Released 2020-03-18.

### Removed

* Removed an internal dependency on the `synstructure` crate when the `derive`
  feature is enabled. This should not have any visible downstream effects other
  than faster build times!

--------------------------------------------------------------------------------

## 0.4.0

Released 2020-01-22.

This is technically a breaking change, but we expect that nearly everyone should
be able to upgrade without any compilation errors. The only exception is if you
were implementing the `Arbitrary::size_hint` method by hand. If so, see the
"changed" section below and the [API docs for
`Arbitrary::shrink`](https://docs.rs/arbitrary/0.4.0/arbitrary/trait.Arbitrary.html#method.size_hint)
for details.

### Added

* Added [the `arbitary::size_hint::recursion_guard` helper
  function][recursion_guard] for guarding against infinite recursion in
  `size_hint` implementations for recursive types.

### Changed

* The `Arbitrary::size_hint` signature now takes a `depth: usize`
  parameter. This should be passed along unmodified to any nested calls of other
  `size_hint` methods. If you're implementing `size_hint` for a recursive type
  (like a linked list or tree) or a generic type with type parameters, you
  should use [the new `arbitrary::size_hint::recursion_guard` helper
  function][recursion_guard].

### Fixed

* Fixed infinite recursion in generated `size_hint` implementations
  from `#[derive(Arbitrary)]` for recursive types.

[recursion_guard]: https://docs.rs/arbitrary/0.4.0/arbitrary/size_hint/fn.recursion_guard.html

--------------------------------------------------------------------------------

## 0.3.2

Released 2020-01-16.

### Changed

* Updated the custom derive's dependencies.

--------------------------------------------------------------------------------

## 0.3.2

Released 2020-01-15.

### Fixed

* Fixed an over-eager assertion condition in `Unstructured::int_in_range` that
  would incorrectly trigger when given valid ranges of length one.

--------------------------------------------------------------------------------

## 0.3.1

Released 2020-01-14.

### Fixed

* Fixed some links and version numbers in README.

--------------------------------------------------------------------------------

## 0.3.0

Released 2020-01-14.

### Added

* Added the `"derive"` cargo feature, to enable `#[derive(Arbitrary)]` for
  custom types. Enabling this feature re-exports functionality from the
  `derive_arbitrary` crate.
* The custom derive for `Arbitrary` implements the shrink method for you now.
* All implementations of `Arbitrary` for `std` types implement shrinking now.
* Added the `Arbitrary::arbitrary_take_rest` method allows an `Arbitrary`
  implementation to consume all of the rest of the remaining raw input. It has a
  default implementation that forwards to `Arbitrary::arbitrary` and the custom
  derive creates a smart implementation for your custom types.
* Added the `Arbitrary::size_hint` method for hinting how many raw bytes an
  implementation needs to construct itself. This has a default implementation,
  but the custom derive creates a smart implementation for your custom types.
* Added the `Unstructured::choose` method to choose one thing among a set of
  choices.
* Added the `Unstructured::arbitrary_len` method to get an arbitrary length for
  a collection of some arbitrary type.
* Added the `Unstructured::arbitrary_iter` method to create an iterator of
  arbitrary instance of some type.

### Changed

* The `Arbitrary` trait was simplified a bit.
* `Unstructured` is a concrete type now, not a trait.
* Switched to Rust 2018 edition.

### Removed

* `RingBuffer` and `FiniteBuffer` are removed. Use `Unstructured` instead.

### Fixed

* Better `Arbitrary` implementation for `char`.
* Better `Arbitrary` implementation for `String`.

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## 0.2.0

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## 0.1.0
